26. A researchers predicts that the effects of music (classical vs. no music) an

Question

26. A researchers predicts that the effects of music (classical vs. no music) and caffeine (caffeine vs. no caffeine) during studying will have significant, and completely additive effects on test performance. In other words, if average test performance is 75%, then the music manipulation will add +/- X% and the caffeine manipulation will add +/- Y% to mean test performance. How many main effects are being predicted by the researcher?

(a) 2

(b) 3

(c) 1

(d) 0

27. From above, how many interactions are being predicted by the researcher?

(a) 2, including both ways to compute the interaction

(b) 0

(c) 1

(d) 1, but a negative cross-over interaction

Explanation / Answer

26 Ans C - 1

because its only more than or less than 75 % performance.

27 Ans A - 2 including both ways to compute the interaction

because 2 studies ate there and results could be plus or minus

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